In the rest of this section, we repeat the original derivation of
divergences in pure QG from the classical paper [1]}.
Since this is not complicated, we shall also include the nonzero
cosmological constant, as it was done in [2]}. The
standard calculation uses the background field method based
on (REF ), the heat-kernel expansion and the Schwinger-DeWitt
technique [3]} (see also [4]} for a detailed
introduction).
